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41106 · Apr 15, 2017

I'm restoring a john deere. As rebuild/repair things, I sandblast everything I can and strip/wire wheel the rest. After I clean the parts I coat with self etching primer. I then rattle can with John deere paint the mating surfaces of objects and hard to get to edges and corners. Once project is totally reassembled I will Spray entire tractor with paint/hardener from Deere. My question is, will this self etching primer be enough, or do I need to spray entire tractor with a sealing primer on top and then paint? Thank you in advance.

showcrop · Apr 15, 2017

Generally self etching is used on new metal, while on old stuff you use epoxy. Epoxy needs to be top-coated within a window that is around 48 hours. After top-coating over a base primer, every tiny scratch, pit, and dimple will show through the paint. If this is OK with what you are looking to achieve it is OK. If you want a nicer smoother finish, after your base primer you will want to apply a fairly heavy coat of primer-surfacer, which fills a lot of scratches and other flaws. A sealing primer comes into play if you get even more proactive about smoothness and use a polyester primer-surfacer. It needs a sealing coat after sanding out. If you are going to be putting a lot of time into the prep, you may want to consider automotive 2K urethane paint. I use Dupont's Nason line. It is a big step up from machinery alkyd enamel that you get at an equipment dealer, but not big money.

Stephen Newell · Apr 15, 2017

The self-etching primer is alright but epoxy primer would be so much better. The rattle can paint is your weakest link. It's a substandard coating which when peals will remove your better topcoat.

Goose · Apr 16, 2017

I'd question the wisdom of doing a lot of sandblasting. Sand has an uncanny knack for getting into places where it's least wanted and most destructive.

David G · Apr 17, 2017

I would definitely plan to disassemble and clean after sand blasting.

41106 · Apr 20, 2017

Thanks for the information Guys! As for sandblasting, the only things getting blasted are parts I remove from tractor and take to a guy with a large blasting set up. I then prime and rattle can where the pieces bolt together with plans of spraying entire tractor at the end. Thanks again.

FBH44 · Apr 21, 2017

That right there is just about the best way to do it.

Married2Allis · Apr 24, 2017

(quoted from post at 05:58:06 04/15/17) The self-etching primer is alright but epoxy primer would be so much better. The rattle can paint is your weakest link. It's a substandard coating which when peals will remove your better topcoat.

You can do the rattle can approach, but you need let it harden and cure before applying the better top coat -- which could be months.

umc · May 4, 2017

Also make sure where ever you used the wire wheel you go back over it with some sand paperby hand .Because the wire wheel spins so fast it sometimes polishes the metal when it stripes it.I have seen people paint over the wire wheel marks and they are so smooth the paint will not stick and lift off even with the etch primer..

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